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ASTM D5492-06

(Test Method)

Standard Test Method for Determination of Xylene Solubles in Propylene Plastics

Standard Test Method for Determination of Xylene Solubles in Propylene Plastics

SIGNIFICANCE AND USE
The results of this test provide a relative measure of the total soluble fraction of polypropylene homopolymers and copolymers. The soluble fraction can be approximately correlated to the amorphous fraction in the polypropylene. Xylene is widely used for determining the soluble fraction in polypropylene. Xylene is more specific to the atactic fraction than other solvents. The concentration of a soluble fraction obtained with a specific solvent has been found to relate closely to the performance characteristics of a product in certain applications, for example film and fiber. Data obtained by one solvent and at one precipitation time cannot be compared with data obtained by another solvent or precipitation time, respectively.
SCOPE
1.1 This test method is to be used for determining the 25°C xylene-soluble fraction of polypropylene homopolymers and copolymers.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Note 1
This test method is technically equivalent to ISO 16152.

General Information

Status
Historical
Publication Date
30-Apr-2006
ICS
83.080.20 - Thermoplastic materials
Technical Committee
D20 - Plastics
Drafting Committee
D20.15 - Thermoplastic Materials
Current Stage
Ref Project

Relations

Replaces
ASTM D5492-98(2003)e1 - Standard Test Method for Determination of Xylene Solubles in Propylene Plastics
Effective Date
01-May-2006
Replaced By
ASTM D5492-10 - Standard Test Method for Determination of Xylene Solubles in Propylene Plastics
Effective Date
01-Aug-2010

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ASTM D5492-06 - Standard Test Method for Determination of Xylene Solubles in Propylene Plastics
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D5492–06
Standard Test Method for
1
Determination of Xylene Solubles in Propylene Plastics
This standard is issued under the fixed designation D5492; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 4. Summary of Test Method
1.1 This test method is to be used for determining the 25°C 4.1 A weighed amount of sample is dissolved in xylene
xylene-soluble fraction of polypropylene homopolymers and under reflux conditions. The solution is cooled under con-
copolymers. trolled conditions and maintained at a +25°C equilibrium
1.2 This standard does not purport to address all of the temperature so that the crystallization of the insoluble fraction
safety concerns, if any, associated with its use. It is the takes place. When the solution is cooled the insoluble portion
responsibility of the user of this standard to establish appro- precipitates and is isolated by filtration. The ortho-xylene is
priate safety and health practices and determine the applica- evaporated from the filtrate, leaving the soluble fraction in the
bility of regulatory limitations prior to use. residue. The percentage of this fraction in the plastic is
determined gravimetrically.
NOTE 1—This test method is technically equivalent to ISO 16152.
5. Significance and Use
2. Referenced Documents
5.1 The results of this test provide a relative measure of the
2
2.1 ASTM Standards:
total soluble fraction of polypropylene homopolymers and
D883 Terminology Relating to Plastics
copolymers. The soluble fraction can be approximately corre-
D1600 Terminology for Abbreviated Terms Relating to
latedtotheamorphousfractioninthepolypropylene.Xyleneis
Plastics
widely used for determining the soluble fraction in polypropy-
E691 Practice for Conducting an Interlaboratory Study to
lene. Xylene is more specific to the atactic fraction than other
Determine the Precision of a Test Method
solvents. The concentration of a soluble fraction obtained with
2.2 ISO Standard:
a specific solvent has been found to relate closely to the
ISO 16152 Plastics—Determination of Xylene Solubles of
performance characteristics of a product in certain applica-
3
Polypropylene
tions, for example film and fiber. Data obtained by one solvent
and at one precipitation time cannot be compared with data
3. Terminology
obtained by another solvent or precipitation time, respectively.
3.1 Definitions:
3.1.1 For definitions of plastic terms see Terminology D883
6. Interferences
and for abbreviations see Terminology D1600.
6.1 Materials with solubilities similar to the soluble frac-
3.2 Definitions of Terms Specific to This Standard:
tion, such as additives, may interfere with the measurement of
3.2.1 soluble-fraction (S )—the percentage of the polymer
S
solubles. When present in concentrations that are judged to
mass that does not precipitate out when the polymer solution is
impart a significant error to the soluble-fraction data, the level
cooledfromrefluxtemperatureto+25 60.5°Candheldatthat
of interference must be determined and corrections made.
temperature for a specified period of time.
6.2 Small-particle fillers and pigments that may pass
throughthefilterandinsolublegelspresentinthepolymermay
cause errors in the measurement.
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
6.3 The polymer flakes and spheres must be dried before
and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materi-
als.
testing to eliminate moisture that can influence the initial
Current edition approved May 1, 2006. Published June 2006. Originally
weight of sample added to the flask.
approved in 1994. Last previous edition approved in 2003 as D5492 - 98(2003).
DOI: 10.1520/D5492-06.
7. Apparatus
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.1 Reflux-Condenser Apparatus, 400 mm, with 24/40 glass
Standards volume information, refer to the standard’s Document Summary page on
joint.
the ASTM website.
3
7.2 Flat-Bottom Boiling Flask, with one or two necks, 400
Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
4th Floor, New York, NY 10036. mL with 24/40 joint, Erlenmeyer flask, or cylindrical bottle.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D5492–06
heat for a minimum of one hour at 80°C to 90°C to ensure the thorough
7.3 Insulation Disk, made
...

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